Protects the motor axle and clip with the bottom plate and when you hit the ground the bracket takes the hit and the dirt to keep your motors clean and lasting longer. The bottom also acts as a spacer of 1mm and in this case I'm using m3x6mm screws (1mm bottom 3mm arm 2mm in motor) The mounting holes is made for the T-Motor MN2206 but it's pretty easy to drill holes for other motors, I can make one without the holes if needed.